/********************************************************************************

* File Name: sensor_node.c

* Author: Jeroen Van Aken

* Organizaion: KU_Leuven-GroupT

* Date: 2015-05-10

* E-mail: jeroen.vanaken@kuleuven.be

* Description: .c file of virtual sensor node

*******************************************************************************/

#define _GNU_SOURCE

#include <stdio.h>

#include <string.h>

#include <stdint.h>

#include <inttypes.h>

#include <time.h>

#include <stdlib.h>

#include <unistd.h>

#include <sys/stat.h>

#include <fcntl.h>

#include "tcpsocket.h"

#include <signal.h>

// conditional compilation option to control the number of measurements this sensor node wil generate

#if (LOOPS > 1)

#define UPDATE(i) (i--)

#else

#define LOOPS 1

#define UPDATE(i) (void)0 //create infinit loop

#endif

// conditional compilation option to log all sensor data to a text file

#ifdef LOG_SENSOR_DATA

#define LOG_FILE "sensor_log"

#define LOG_OPEN() \

FILE *fp_log; \

do { \

fp_log = fopen(LOG_FILE, "w"); \

if ((fp_log)==NULL) { \

printf("%s\n","couldn't create log file"); \

exit(EXIT_FAILURE); \

} \

} while(0)

#define LOG_PRINTF(sensor_id,temperature,timestamp) \

do { \

fprintf(fp_log, "%" PRIu16 " %g %ld\n", (sensor_id), (temperature), (long int)(timestamp)); \

fflush(fp_log); \

} while(0)

#define LOG_CLOSE() fclose(fp_log);

#else

#define LOG_OPEN(...) (void)0

#define LOG_PRINTF(...) (void)0

#define LOG_CLOSE(...) (void)0

#endif

#define INITIAL_TEMPERATURE 20

#define TEMP_DEV 5 // max afwijking vorige temperatuur in 0.1 celsius

int running = 1;

Socket client;

uint16_t sensor_id;

void print_help(void);

time_t timestamp;

double temperature = INITIAL_TEMPERATURE;

/*

* argv[1] = sensor ID

* argv[2] = sleep time

* argv[3] = server IP

* argv[4] = server port

*/

void my_handler(){

signal(SIGINT,SIG_DFL);

printf("sensor_node %d was closed\n",sensor_id);

running = 0;

double k = 100.001;

tcp_send( client, (void *)&sensor_id, sizeof(sensor_id));

tcp_send( client, &k, sizeof(temperature));

tcp_send( client, (void *)&timestamp, sizeof(timestamp));

}

//argv[]

int main( int argc, char *argv[] )

{

long int sleep_time;

int server_port;

char server_ip[] = "000.000.000.000";

LOG_OPEN();

if (argc != 5)

{

print_help();

exit(EXIT_SUCCESS);

}

else

{

// to do: user input validation!

sensor_id = atoi(argv[1]);

sleep_time = atoi(argv[2]);

strncpy(server_ip, argv[3],strlen(server_ip));

server_port = atoi(argv[4]);

//printf("%d %ld %s %d\n", sensor_id, sleep_time, server_ip, server_port);

}

srand48( time(NULL) );

// open TCP connection to the server; server is listening to SERVER_IP and PORT

client = tcp_active_open( server_port, server_ip );

int i=LOOPS;

signal(SIGINT, my_handler);

while(running)

{

temperature = temperature + TEMP_DEV * ((drand48() - 0.5)/10);

time(&timestamp);

// send data to server in this order (!!): <sensor_id><temperature><timestamp>

// remark: don't send as a struct!

tcp_send( client, (void *)&sensor_id, sizeof(sensor_id));

tcp_send( client, (void *)&temperature, sizeof(temperature));

tcp_send( client, (void *)&timestamp, sizeof(timestamp));

LOG_PRINTF(sensor_id,temperature,timestamp);

sleep(sleep_time);

UPDATE(i);

}

i = 0;

tcp_close( &client );

LOG_CLOSE();

exit(EXIT_SUCCESS);

}

void print_help(void)

{

printf("Use this program with 4 command line options: \n");

printf("\t%-15s : a unique sensor node ID\n", "\'ID\'");

printf("\t%-15s : node sleep time (in sec) between two measurements\n","\'sleep time\'");

printf("\t%-15s : TCP server IP address\n", "\'server IP\'");

printf("\t%-15s : TCP server port number\n", "\'server port\'");

}